Development of an Internal Camera–Based Volume Determination System for Triaxial Testing

A triaxial testing cell was instrumented with an internal camera monitoring system. By placing the camera monitoring system inside of the triaxial cell, optical distortions due to refraction at the confining fluid–cell wall and cell wall–atmosphere interfaces and the curvature of the cell wall were eliminated. The components of the system are presented. Furthermore, the photogrammetric techniques that were utilized to analyze the photographs that were captured from within the triaxial cell are discussed. The proposed methods for acquiring and analyzing the photographs are presented and the potential for the inclusion of an internal camera–monitoring system for triaxial testing applications are discussed.

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